private string _sComPortNumber; private bool _bFoundPortNumber; private System.Windows.Forms.Control _oStaticShow; private System.IO.Ports.SerialPort _oCIMControler; /// 
 /// COM口名 /// 
         public string ComPortName { get { return _sComPortNumber; } } /// 
 /// 编码 /// 
         public Encoding StringEncoding { get; set; } /// 
 /// 比特率 /// 
         public int BaudRate { get; set; } /// 
 /// 数据位 /// 
         public int DataBits { get; set; } /// 
 /// 奇偶检验 /// 
         public System.IO.Ports.Parity Parity { get; set; } /// 
 /// 停止位 /// 
         public System.IO.Ports.StopBits StopBits { get; set; } private bool OpenPortAndSendMsg()         {
    foreach (string tmpName in System.IO.Ports.SerialPort.GetPortNames())             {
    foreach (string sCurrentMachinePortNumber in System.IO.Ports.SerialPort.GetPortNames())                 {
    try                     {
    if (_bFoundPortNumber == false)                         {
                                System.IO.Ports.SerialPort otmpsp = new System.IO.Ports.SerialPort();                             otmpsp.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(otmpsp_DataReceived);                             otmpsp.PortName = sCurrentMachinePortNumber;                             otmpsp.BaudRate = this.BaudRate;                             otmpsp.DataBits = this.DataBits;                             otmpsp.Parity = this.Parity;                             otmpsp.StopBits = this.StopBits;                             otmpsp.Open(); //写数据************************                             otmpsp.Write(new byte[] { 2 }, 0, 1); string Command = "ST";                             otmpsp.Write(Command);                             otmpsp.Write(new byte[] { 3 }, 0, 1);                             otmpsp.Write(new byte[] { 6 }, 0, 1);                             otmpsp.Write(new byte[] { 5 }, 0, 1); //****************************                             System.Threading.Thread.Sleep(500);                             otmpsp.Close();                         } else                         {
    return true;                         }                     } catch (Exception ex)                     {
                        }                 }             } return false;         } void otmpsp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)         {
                System.IO.Ports.SerialPort oSenderObject = sender as System.IO.Ports.SerialPort; if (oSenderObject.BytesToWrite > 0)             {
                    oSenderObject.BaseStream.Flush();             } int iReadFlag = oSenderObject.BytesToRead; while (iReadFlag > 0)             {
    string sReturn = oSenderObject.ReadExisting(); if (sReturn.Contains(""))                 {
                        _bFoundPortNumber = true;                     _sComPortNumber = oSenderObject.PortName;                 }                 iReadFlag = oSenderObject.BytesToRead;             }         }